Re: slow release version - C / C++ / MFC Discussion Boards

valerie992-Aug-05 9:45

2-Aug-05 9:45

hi, when i run on on of my application in visual studio, it takes up to 100% of the usage sometime, does it mean the exe might just crashed?

Re: hi.....I am using 100% of cpu usage

peterchen2-Aug-05 20:20

peterchen

2-Aug-05 20:20

No, that's normal. (Anonymous is, erm, wrong)

Please also see my other reply

Pandoras Gift #44: Hope. The one that keeps you on suffering.
aber.. "Wie gesagt, der Scheiss is' Therapie"
boost your code || Fold With Us! || sighist | doxygen

Re: CU history ...Ctrl + Alt +Del

peterchen2-Aug-05 20:18

peterchen

2-Aug-05 20:18

That is not right.

Even a low priority program will get 100% of CPU power when no other program is running.

Reasons why a program does not use 100% of CPU:
- it is waiting for user input
- it is waiting for external hardware (e.g. hard drive)
- It "gives up" CPU cycles (Sleep(), WaitFor* etc.) for one or another reason

The first two are the most common why on a modern system you rarely reach 100% CPU power e.g. with office.

Pandoras Gift #44: Hope. The one that keeps you on suffering.
aber.. "Wie gesagt, der Scheiss is' Therapie"
boost your code || Fold With Us! || sighist | doxygen

Re: CU history ...Ctrl + Alt +Del

Tim Smith2-Aug-05 9:33

Tim Smith

2-Aug-05 9:33

You are on a dual processor machine. The only way to use 100% would to have two threads RUNNING INDEPENDENTLY.

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

Re: CU history ...Ctrl + Alt +Del

Andy Brummer2-Aug-05 9:35

Andy Brummer

2-Aug-05 9:35

Your CPU has hyper-threading which makes it show up as a dual processor system. In order to take full advantage of the CPU, you need to use mutiple threads in your app, which is usually much more difficult, unless approach is naturally parallelizable.

Re: CU history ...Ctrl + Alt +Del

peterchen2-Aug-05 20:15

peterchen

2-Aug-05 20:15

j_s_lacroix wrote:
I can see that there is 2 graphics

Pentium 4 processors have Hyperthreading (try google). The OS sees that as two CPUs.

Do you have 100% on one, 50% on one, or 50% on both?

100% on one:
The program is single threaded, and uses one CPU to the maximum. Only a multithreaded program can emplo more than one CPU.

50% one one (or both):
Two possibilities: (A) the task is regulary giving up CPU power (e.g. by Sleep(), or WaitFor*() for thread synchronization). (B) some other component such as File I/O is slowing you down.
if the simulation heavily works with external files, or does graphics, it is probably (B)

Pandoras Gift #44: Hope. The one that keeps you on suffering.
aber.. "Wie gesagt, der Scheiss is' Therapie"
boost your code || Fold With Us! || sighist | doxygen

slow release version

valerie992-Aug-05 9:04

valerie99

2-Aug-05 9:04

the program will works fine on small set of data just fine......but in large data, the dialog window will come up and with just 0s then started processed after 5 minutes.

this only happened on release version, debug version works fine no matter what size of data.

could anyone tell me what to look? I have generated the debug info on release version, but it's really hard to tell where went wrong, because it didn't really crash, it's just slow....

if I turn off the optimazation, it will be even slower -- take 10 minutes to start!

any info will be greatly appreciated!

Re: slow release version

Anonymous2-Aug-05 9:05

Anonymous

2-Aug-05 9:05

What is the program intended to do?

Re: slow release version

valerie992-Aug-05 9:42

valerie99

2-Aug-05 9:42

it supposed to check on the history of call record and create report for those duplicate record.....seems like it is in some infinite loop somewhere, but i can't find it.

thanks for your reply

Re: slow release version

Blake Miller3-Aug-05 10:57

Blake Miller

3-Aug-05 10:57

Check ALL of your classes for uninitialized member variables.
Examine use of pointers to make sure they are all initialized.
Turn thecompiler warning up to 4 and pay attention to ANY warning like "use of varible 'x' before it is initialized".

These are typical scenarios when 'debug' works fine and 'release' does not. The debug sets up memory differently and masks illegal use of variables and pointers!

Re: slow release version

Tim Smith2-Aug-05 9:45

Tim Smith

2-Aug-05 9:45

There is a good chance you have an O^x loop (where x > 1) in your code. For example, if you had a O^2 loop, 10 data elements would require 10^2 or 100 iterations of the loop. 20 data elements would require 400 iterations. A simple doubling of the data set size requires four times as long to run. So going from 10 -> 10000000 would make the program appear to take forever.

I've seen some programs with an O^4 loop that wasn't required.

Or you just have an infinite loop. Try writing to a log file to check for progress.

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

Drive Directory Emergency!! Help Me

ultracrap2-Aug-05 8:54

ultracrap

2-Aug-05 8:54

How do I tell C++ to scan a specific drive and output the name of the files and folders that are on that drive?

Re: Drive Directory Emergency!! Help Me

David Crow2-Aug-05 9:17

David Crow

2-Aug-05 9:17

By using the FindFirstFile()/FindNextFile() pair.

"One must learn from the bite of the fire to leave it alone." - Native American Proverb

Madness

sroberts822-Aug-05 8:36

sroberts82

2-Aug-05 8:36

currentIE = (UplinkMapIE*)malloc((uplinkMap->numberUL_MAP_IE + 2) * sizeof(UplinkMapIE));

Can anyone explain whats going on here at all? Thanks in advance
Ste

Re: Madness

C^hris L^osinger2-Aug-05 16:05

C^hris L^osinger

2-Aug-05 16:05

it's allocating (uplinkMap->numberUL_MAP_IE + 2) * sizeof(UplinkMapIE) bytes. sizeof(UplinkMapIE) is the size of the UplinkMapIE structure (or class). so, it's allocating room for (uplinkMap->numberUL_MAP_IE + 2) UplinkMapIE structs.

then it's assigning the return from malloc to a pointer to an UplinkMapIE.

Cleek | Image Toolkits | Thumbnail maker

Play Media File

Aqueel2-Aug-05 7:35

Aqueel

2-Aug-05 7:35

As i told you that i have inserted media player in my application as an activex control. I allow user to select a media file using File open dialog. Then the selected file will be played in that media player. I do not want to open saparate media player to play file. Also play, as i know is not a valid verb for ShellExcute function.

We Believe in Excellence

CString!!!

Smith#2-Aug-05 5:52

Smith#

2-Aug-05 5:52

i want the text to be formatted like.. value of x=5, for doing this,

CString msg ="value of x=";
int num =5;

Msg.Format(Msg,"%d", num); //i dont want like "value of x" here lke ("val of x"%d,num)

output should be --> "value of x=5"
but its printing only --> "value of x"

regards,
Rookie

Re: CString!!!

Marc Soleda2-Aug-05 6:04

Marc Soleda

2-Aug-05 6:04

Look here[^]

Marc Soleda.

... she said you are the perfect stranger she said baby let's keep it like this... Tunnel of Love, Dire Straits.

Re: CString!!!

BadKarma2-Aug-05 6:14

BadKarma

2-Aug-05 6:14

hi,

you schould do one of the following:

// 1 method: place the formating in a formating text<br />
CString strMsg = "value of x = %d";<br />
int num =5;<br />
<br />
strMsg.Format(strMsg, num); <br />
<br />
// 2 method: only text in the <br />
CString strMsg = "value of x =";<br />
int num =5;<br />
<br />
// but then you need to add a formating parameter using '+'<br />
<small>// Msg.Format(Msg,"%d", num); //i dont want like "value of x" here lke ("val of x"%d,num)</small><br />
strMsg.Format(strMsg + "%d", num);

The reason you ended up without the 5 is because the Format function didn't see any formating paramaters and therefore only placed "value of x=" in the object.
Hope this sets you on the way

Regards,
Kurt Pattyn

codito ergo sum

Re: CString!!!

Smith#2-Aug-05 6:44

Smith#

2-Aug-05 6:44

nice stuff frm u and marc... thanx guys..
its done Smile | :)

regards,
Rookie

Re: CString!!!

Peter Weyzen2-Aug-05 10:33

Peter Weyzen

2-Aug-05 10:33

And don't forget:

<br />
CString strMsg = "value of x =";<br />
int num =5;<br />
<br />
// but then you need to add a formating parameter using '+'<br />
// Msg.Format(Msg,"%d", num); //i dont want like "value of x" here lke ("val of x"%d,num)<br />
strMsg.AppendFormat("%d", num);<br />

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<br />
Peter Weyzen<br />
Staff Engineer<br />
<A HREF="http://www.santacruznetworks.com">Santa Cruz Networks</A>

How to play a media file

Aqueel2-Aug-05 4:52

Aqueel

2-Aug-05 4:52

Hello
I have added windows media file in dialog based application as an activeX control. Now i want to play a file in it. Please tell me how can i do that?

Thanks

We Believe in Excellence

Access violation reading location

Bruce Pataki2-Aug-05 4:50

Bruce Pataki

2-Aug-05 4:50

I am creating an MFC application with activeX document server support. The application runs perfectly fine when i run as a standalone application. But when i run the application in Internet explorer,
it opens however opening a form from the top menubar, it gives an error "access violation reading
location" having error code 0xC0000005 (Running in standalone mode does not give this error).

I have used global pointers to the objects I need.
In application class, i have declared a object as

TestClass* tm; //tm is a global pointer to TestClass

In application class, InitInstance() function i initialize the pointer as

tm = new TestClass();

AND i call the following code on Menu click as

{
tm->doModal();
}

I get the access violation error when i call DoModal().
I have to use tm as a global pointer to TestClass since using
local pointer has not worked. If you have any workaround, please help.

Thanks.

Bruce

a standard call for get current directory?

IlanTal2-Aug-05 4:36

IlanTal

2-Aug-05 4:36

Is there a more standard way from within MFC to get the current working directory? What I’m using is _getcwd(buff, 50). It does the job, but I’m wondering if I should be using something else (which I can’t as now find)?

Thanks,
Ilan

Re: a standard call for get current directory?

Marc Soleda2-Aug-05 4:44

Marc Soleda

2-Aug-05 4:44

Platform SDK call:

TCHAR szDirectory[MAX_PATH] = "";

::GetCurrentDirectory(sizeof(szDirectory) - 1, szDirectory);

Marc Soleda.

... she said you are the perfect stranger she said baby let's keep it like this... Tunnel of Love, Dire Straits.

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